/Engine/Source/Editor/UnrealEd/Public/Kismet2/BlueprintEditorUtils.h
Duplicates a variable given its name and Blueprint
Returns the name of the new variable or NAME_None if failed to duplicate
static [FName](API\Runtime\Core\UObject\FName) DuplicateVariable ( [UBlueprint](API\Runtime\Engine\Engine\UBlueprint) * InBlueprint, const [UStruct](API\Runtime\CoreUObject\UObject\UStruct) * InScope, [FName](API\Runtime\Core\UObject\FName) InVariableToDuplicate )